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Fri, 25 Oct 2019 16:49:39 +0000 Received: from b01ledav003.gho.pok.ibm.com (b01ledav003.gho.pok.ibm.com [9.57.199.108]) by b01cxnp22035.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x9PGncQR51839294 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 25 Oct 2019 16:49:38 GMT Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7369DB205F; Fri, 25 Oct 2019 16:49:38 +0000 (GMT) Received: from b01ledav003.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7C168B2065; Fri, 25 Oct 2019 16:49:37 +0000 (GMT) Received: from [9.85.155.79] (unknown [9.85.155.79]) by b01ledav003.gho.pok.ibm.com (Postfix) with ESMTP; Fri, 25 Oct 2019 16:49:37 +0000 (GMT) Subject: Re: [PATCH v9 1/8] powerpc: detect the secure boot mode of the system To: Lakshmi Ramasubramanian , Nayna Jain , linuxppc-dev@ozlabs.org, linux-efi@vger.kernel.org, linux-integrity@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Ard Biesheuvel , Jeremy Kerr , Matthew Garret , Mimi Zohar , Greg Kroah-Hartman , Claudio Carvalho , George Wilson , Elaine Palmer , Eric Ricther , "Oliver O'Halloran" , Prakhar Srivastava References: <20191024034717.70552-1-nayna@linux.ibm.com> <20191024034717.70552-2-nayna@linux.ibm.com> From: Nayna Jain Message-ID: <569f401a-4327-4295-677f-48037f2582a0@linux.vnet.ibm.com> Date: Fri, 25 Oct 2019 11:49:37 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-10-25_08:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1910250154 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/24/19 12:26 PM, Lakshmi Ramasubramanian wrote: > On 10/23/2019 8:47 PM, Nayna Jain wrote: >> This patch defines a function to detect the secure boot state of a >> PowerNV system. > >> +bool is_ppc_secureboot_enabled(void) >> +{ >> +    struct device_node *node; >> +    bool enabled = false; >> + >> +    node = of_find_compatible_node(NULL, NULL, "ibm,secvar-v1"); >> +    if (!of_device_is_available(node)) { >> +        pr_err("Cannot find secure variable node in device tree; >> failing to secure state\n"); >> +        goto out; > > Related to "goto out;" above: > > Would of_find_compatible_node return NULL if the given node is not found? > > If of_device_is_available returns false (say, because node is NULL or > it does not find the specified node) would it be correct to call > of_node_put? of_node_put() handles NULL. Thanks & Regards,      - Nayna